增施钾肥对设施辣椒生长和养分含量的影响OA

To investigate the effects of potassium fertilizer on pepper growth,using Hangjiao Zaoxiu as the material,this study examined the effect of different potassium application rates during the top-dressing period on the agronomic traits,yield,and nutrient contents of peppers,and conducted a correlation analysis between potassium application rates and pepper nutrient content.The results showed that compared with potassium application rate(based on K2O,the same as below)of 120 kg·hm-2(CK),potassium application rate of 180 kg·hm-2 significantly(p＜0.05)increased the nitrogen,phosphorus,and potassium content of pepper leaves by 3.39,0.17,and 0.49 mg·g-1,respectively.The nitrogen and phosphorus content of pepper fruits significantly increased by 1.68 and 0.18 mg·g-1,respectively.The phosphorus content of pepper stems significantly increased by 0.25 mg·g-1,and the phosphorus content of pepper roots significantly increased by 0.20 mg·g-1.Furthermore,potassium application rate of 240 kg·hm-2 resulted in a significant increase of 1.67 mm in transverse diameter of pepper fruits compared with CK.However,it also led to a significant decrease of 1.33 in fruit shape index along with a significant reduction of amino acid content by 9.17 μmol·g-1 compared with CK.Moreover,compared with potassium application rate of 180 kg·hm-2,it inhibited the absorption and accumulation of nitrogen,phosphorus,and potassium by pepper leaves,possibly due to excessive application of potassium fertilizer.